.forward	yes (empty files; can enable/disable mail to /file or |command)
/usr/mail	yes (compile time option)
/usr/spool/mail	yes (compile time option)
/var/mail	yes (compile time option)
/var/spool/mail	yes (compile time option)
:include:	yes (mail to /file and |command is off by default)
aliases		yes (can enable/disable mail to /file or |command)
bare newlines	yes (but will send CRLF)
blacklisting	yes (client name/addr; helo hostname; mail from; rcpt to)
content filter	yes
db tables	yes (compile time option)
dbm tables	yes (compile time option)
delivered-to	yes
dsn		not yet (bounces have DSN form)
errors-to:	yes
esmtp		yes
etrn support	yes (uses per-destination log or flushes entire queue)
fcntl locking	yes (runtime configurable)
flock locking	yes (runtime configurable)
home mailbox	yes
ident lookup	no
ldap tables	yes (contributed)
luser relay	yes
lmtp support	yes (client)
m4 config	no
mail to command	yes (configurable for .forward, aliases, :include:)
mail to file	yes (configurable for .forward, aliases, :include:)
maildir		yes (with procmail)
mailertable	yes (it's called transport)
mailq		yes
majordomo	yes (edit approve script to delete /delivered-to/i)
mime conversion	not yet; postfix uses just-send-eight
missing <>	yes (most common address forms)
mysql tables	yes (contributed)
netinfo tables	yes (contributed)
newaliases	yes (main alias database only)
nis tables	yes
nis+ tables	not yet
pipeline option	yes (server and client)
pop/imap	yes (with third-party daemons that use /var[/spool]/mail)
rbl support	yes
return-receipt:	not yet
sasl support	yes (compile time option)
sendmail -bt	no
sendmail -q	yes
sendmail -qRxxx	yes
sendmail -qSxxx	no
sendmail -qtime	ignored
sendmail -v	no
sendmail.cf	no (uses table-driven address rewriting)
size option	yes, server and client
smarthost	yes
tcp wrapper	no (use built-in blacklist facility)
user+extension	yes (also: .forward+extension)
user-extension	yes (also: .forward-extension)
user.lock	yes (runtime configurable)
uucp support	yes (sends user@domain recipients)
virtual domains	yes
year 2000 safe	yes